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4x+2+4x+2+3x+7=90
We move all terms to the left:
4x+2+4x+2+3x+7-(90)=0
We add all the numbers together, and all the variables
11x-79=0
We move all terms containing x to the left, all other terms to the right
11x=79
x=79/11
x=7+2/11
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